Took the car to the dealer several times without results. Called MBA without result. I will loose power many times in a month. Have to pull over and restart the car, and it will work fine for a while. No rhyme or reason. Replaced the EGR valve ( $ 850.00 ) to no avail. Hope nobody gets killed before issue is resolved. Bought the car new. Bought one for the wife a week after mine, and never had similar problem.